I would suggest setting this up as a report in either SFDC or Marketo. An advantage of setting this up in SFDC is that your sales people might be more inclined to view the report if it's in the same location as where they work all day. Maybe you have an SFDC admin internally who can help with this? Once they have a report where they can identify anyone who has engaged in the past week, MSI will show the activity history as Kim said.
If you go through Marketo, I still think the Web Page Activity report is your best bet because it will send them a list of anyone who meets your qualifications, with their name as a link so that they can click and be delivered to the person's Marketo record. Just set up the report using the smart list tab like you did in your example above, and under subscriptions you can set the automated send information.